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Re: netbsd PVH dom0: xen clock event stops
- To: Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 17 Nov 2020 10:02:04 +0100
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- Delivery-date: Tue, 17 Nov 2020 09:05:30 +0000
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On Mon, Nov 16, 2020 at 07:22:11PM +0100, Manuel Bouyer wrote:
> On Sun, Nov 15, 2020 at 07:24:16PM +0100, Roger Pau Monné wrote:
> > On Sun, Nov 15, 2020 at 06:49:38PM +0100, Manuel Bouyer wrote:
> > > Hello,
> > > I spent some more time debugging NetBSD as a PVH dom0 on Xen,
> > > With Roger's patch to avoid a Xen panic, the NetBSD kernel stalls
> > > configuring devices. At first I though it was an issue with hardware
> > > interrupts, but it more likely is an issue with Xen timer events.
> > > Specifically: virtual CPU 0 stops receiving timer events, while other
> > > CPUs keep receiving them. I tried to force a timer rearm but this didn't
> > > help.
> > > The event is not masked nor pending on Xen or NetBSD, as confirmed by 'q'.
> > > Others events (the Xen console, the debug event) are properly received
> > > by CPU0. I don't know how to debug this more at this point.
> >
> > You could try to use dom0_vcpus_pin command line option and then dump
> > the timers using the 'a' debug key, this way you can see if CPU0 has a
> > timer pending (which would be the vCPU0 timer).
>
> thanks, this helped. This was a bug in the NetBSD kernel, which would show
> up only when there are enough physical device interrupts (which explains why
> I didn't notice it on PVH domUs)
Great! So all interrupts are working as expected now?
Roger.
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